That story leaves out significant details, and his description of the reason is wrong. He leaves out significant prior sources and reasons, to the point your statement "It was not created to help artists or whoever" is simply wrong.
Wikipedia provides a far better history with extensive sources [1]. Note for example the section "Early Developments" where they list precursors to anything in your source as having significant components of individual and author rights.
Note also in the US copyright law was started by author guilds wanting author protection, and the first federal copyright act in 1790 was about protection for authors, not for printers. This was an extension of many states laws that had passed author protections.